Oxygen levels have decreased during a period of exercise, leading to an increase in respiration rate. In the feedback system that regulates blood gasses, the lungs are acting as the
A) receptor
B) control center
C) stimulus
D) effector

Question

Quizplus · Accepted Answer

The lungs are the effector in the feedback system that regulates blood gasses. They respond to the decreased oxygen levels by increasing respiration rate to bring in more oxygen and release carbon dioxide. The receptor in this system is the chemoreceptors in the carotid and aortic bodies that detect changes in blood gasses. The control center is the medulla oblongata, which receives input from the chemoreceptors and sends signals to the lungs to adjust respiration rate. The stimulus is the decreased oxygen levels that trigger the feedback system.

Oxygen Levels Have Decreased During a Period of Exercise, Leading